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Structure, glass-forming ability, magnetic and cryogenic magneto-caloric properties in the amorphous Ni30Co10RE60 (RE = Ho and Tm) ribbons
- Guo, Dan, Zhang, Yikun, Geng, Shuhua, Xu, Hui, Ren, Zhongming, Wilde, Gerhard
- Journal of materials science 2018 v.53 no.13 pp. 9816-9822
- X-ray diffraction, entropy, glass, magnetic fields, magnetic properties, microstructure, phase transition, temperature, transmission electron microscopy
- Amorphousized Ni₃₀Co₁₀RE₆₀ (RE = Ho and Tm) ribbons have been prepared by melt-spinning technique, and their microstructure, glass formation ability, magnetic properties and cryogenic magneto-caloric effect (MCE) were systematically investigated. Based on the X-ray diffraction and high-resolution transmission electron microscopic, the Ni₃₀Co₁₀Ho₆₀ and Ni₃₀Co₁₀Tm₆₀ ribbons show fully amorphous structure. The ribbons are confirmed to reveal a second-order magnetic phase transition (paramagnetic to ferromagnetic) by the magnetization measurements and Arrott plot analysis. A considerable MCE is found in Ni₃₀Co₁₀Ho₆₀ and Ni₃₀Co₁₀Tm₆₀ ribbons around their respective Curie temperatures (TC) of 22.7 and 6.3 K, respectively. Under a magnetic field change (∆H) of 0–5 T, the magnetic entropy change (− ∆SM) reaches 12.5 and 14.2 J/kg K, and the relative cooling power reaches 447 and 242 J/kg for Ni₃₀Co₁₀Ho₆₀ and Ni₃₀Co₁₀Tm₆₀, respectively.